methyl (3aR,4R,5S,5aR,10bR,13aR)-4-(acetyloxy)
3a-ethyl-9-[(5R,7S,9S)-5-ethyl-5,6-dihydroxy-9
(methoxycarbonyl)-1,4,5,6,7,8,9,10-octahydro-2H
3,7-methanoazacycloundecino[5,4-b]indol-9-yl]-6
formyl-5-hydroxy-8-methoxy-3a,4,5,5a,6,11,12,13a
octahydro-1H-indolizino[8,1-cd]carbazole-5-carboxylate
(3′-hydroxy-VCR)